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Updated: Jun 21, 2025
Imaging the Intracellular Trafficking of APP with Photoactivatable GFP
Published on: October 17, 2015
SIL1 improves cognitive impairment in APP23/PS45 mice by regulating amyloid precursor protein processing and Aβ
Qunxian Wang1, Yanshuang Jiang1, Zijun Meng1
1Chongqing Key Laboratory of Child Neurodevelopment and Cognitive Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing 400000, China.
SIL1 protein protects against Alzheimer's disease by reducing amyloid precursor protein (APP) processing. Overexpressing SIL1 improved cognitive function and decreased amyloid plaques in mouse models.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Alzheimer's disease (AD) is a neurodegenerative disorder characterized by amyloid-beta plaques.
- SIL1, an endoplasmic reticulum protein, has shown protective effects in AD.
- The specific role of SIL1 in amyloid precursor protein (APP) processing is not well understood.
Purpose of the Study:
- To investigate the effect of SIL1 on APP processing in vitro and in vivo.
- To determine if SIL1 modulation impacts cognitive function and amyloid pathology in AD models.
Main Methods:
- Cellular models with Swedish mutant APP695 were used for in vitro studies (SIL1 overexpression/knockdown).
- Adeno-associated virus (AAV)-mediated SIL1 gene transfer was performed in APP23/PS45 transgenic mice.
- Techniques included Western blotting, immunohistochemistry, RNA sequencing, and behavioral tests (Y-maze, Morris Water maze).
Main Results:
- SIL1 expression was reduced in APP23/PS45 mice.
- SIL1 overexpression decreased APP, presenilin-1 (PS1), and APP C-terminal fragments (CTFs) levels.
- SIL1 knockdown increased APP, BACE1, PS1, CTFs, and APP mRNA levels.
- SIL1 overexpression reduced senile plaques and improved cognitive deficits in APP23/PS45 mice.
Conclusions:
- SIL1 inhibits the amyloidogenic processing of APP.
- SIL1 overexpression ameliorates cognitive impairment in a mouse model of AD.
- SIL1 represents a potential therapeutic target for AD by modulating APP processing.
